Problems Geotagging

Good Morning.

I have made numerous flights with pixhawk connected to a sony a5100.

In each of them, trying to make geotagging I have problems, because there are more photos than registered positions.

This happens if you use the tlog I record on my pc, or use the bin recorded directly in memory pixhawk.

They have any idea what could be happening ?, because the pilot does not record the position of some of the cameras?

We are talking about more or less 1200 10 photos.